Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((mang xa) or (lang xa)) hoi. hieu ve nam thuc dan ((hanh hai) OR (hang hai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((mang xa) OR (lang xa)) hoi. hieu ve nam thuc dan ((hanh hai) OR (hang hai)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((mang xa) or (lang xa)) hoi. hieu ve nam thuc dan ((hanh hai) OR (hang hai)) cua triet*".